| We would like to offer to some customers of ours some sort of network
| backup/archive. They would put daily or weekly backups from their local
| machine on our server using rsync and SSH. Therefore, they all have a
| user account on our server. However, we must ensure that they would
| absolutely not be able to access any data of each other at all.

Just my 2 cents: I've found very useful some shells that permits just some
subset of commands, for example shells/scponly, sysutils/bksh or
sendmail's smrsh.

Since you're using ssh you might also find useful the command= statement
in .ssh/authorized_keys

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